Thank you for your reply. By deleting stuff from the card, I mean the data that I have saved in the excel spreadsheet in the SD card. I remove the SD card and plug it into my laptop and make a backup of the values recorded. then I delete the data present in the excel spreadsheet, close it and insert the SD card back into the controller. when I do that, it does not record values anymore. I have to format the SD card again using SD card suite and insert it back in for it to start recording values.
Additionally, this panel is shipped to the customer and he does not want to go through the trouble of using SD card suite. Its easy for the operator to remove SD card, create a back up by copying data from spreadsheet and inserting the card back in again.
BR
Syed